Question

\(\sqrt{\dfrac{1-2x}{^{x^2}}}\) có nghĩa khi

Answer 1

\(\sqrt{\dfrac{1-2x}{x^2}}\)

\(ĐK:\dfrac{1-2x}{x^2}\ge0\)

\(\Leftrightarrow\left\{{}\begin{matrix}1-2x\ge0\\x\ne0\end{matrix}\right.\)(do \(x^2>0\forall x\))

\(\Leftrightarrow\left\{{}\begin{matrix}x\le\dfrac{1}{2}\\x\ne0\end{matrix}\right.\)

Answer 2

\(\sqrt{\dfrac{1-2x}{x^2}}\) có nghĩa khi x < \(\dfrac{1}{2}\)